MEXICO CITY (AP) — Hundreds of teachers are blocking the entrance to Mexico’s Chamber of Deputies to prevent federal lawmakers from debating and voting on a set of rules to apply a recently approved overhaul of the education system.

Lawmakers decided Wednesday evening to meet at a convention center, although they haven’t yet convened.

The most contested part of the school reforms would create a professional system for hiring, evaluating and promoting teachers without the “discretionary criteria” currently used in a system in which teaching positions are often bought or inherited.

Protesting teachers tried to force their way into the chamber Monday but were pushed back by federal police.

A teachers group has been protesting since last week by blocking traffic in already clogged streets in the capital.